【发布时间】：2014-08-15 10:45:42
【问题描述】：
我试图从我的JTable 中删除一行，而不向绑定的 MySQL 数据库发送更新。澄清一下：删除的行仍应存储在数据库中，但从我的 GUI 中可见的JTable 中删除。
import javax.swing.*;
import javax.swing.border.LineBorder;
import javax.swing.border.TitledBorder;
import javax.swing.table.DefaultTableModel;
import java.awt.*;
import java.awt.event.*;
import java.sql.*;
import com.mysql.*;
import java.util.*;
public class Days {
private DefaultTableModel tblModel;
JTable days;
private JTextField ttask;
private JTextField ttime;
private JTextField txtSearch;
private Statement st;
private JButton add=new JButton("Add");
private JButton delete= new JButton("Delete");
private JPanel panelinfo;
private PreparedStatement ps;
JFrame frame;
Connection con;
ResultSet r;
public Days(final String s){
frame = new JFrame();
frame.setBounds(100, 100, 598, 470);
frame.getContentPane().setLayout(null);
frame.setTitle("NoTimeNoLife");
panelinfo = new JPanel();
panelinfo.setBorder(new TitledBorder(null, "Add your Schedule:", TitledBorder.LEADING, TitledBorder.TOP, null, null));
panelinfo.setBounds(243, 76, 329, 135);
JLabel a1 = new JLabel("Time :");
a1.setBounds(10, 30, 46, 14);
panelinfo.add(a1);
JLabel a2 = new JLabel("Task :");
a2.setBounds(10, 85, 46, 14);
panelinfo.add(a2);
frame.getContentPane().add(panelinfo);
panelinfo.setLayout(null);
add.setBounds(250, 222, 73, 30);
frame.getContentPane().add(add);
delete.setBounds(333, 222, 73, 30);
frame.getContentPane().add(delete);
ttime = new JTextField();
ttime.setColumns(10);
ttime.setBounds(93, 28, 206, 20);
panelinfo.add(ttime);
ttask = new JTextField();
ttask.setColumns(10);
ttask.setBounds(93, 84, 206, 20);
panelinfo.add(ttask);
JPanel panel = new JPanel();
panel.setBorder(new TitledBorder(null, "DisplayId", TitledBorder.LEADING, TitledBorder.TOP, null, null));
panel.setBounds(10, 76, 230, 86);
frame.getContentPane().add(panel);
panel.setLayout(null);
txtSearch = new JTextField();
txtSearch.setBounds(10, 26, 210, 20);
panel.add(txtSearch);
txtSearch.setColumns(10);
String [] columnNames = {"id", "Time", "Task"};
days = new JTable(new DefaultTableModel(null, new Object[]{"id", "Time","Task"}));
tblModel = (DefaultTableModel) days.getModel();
days = new JTable(tblModel){
public boolean isCellEditable(int rowIndex, int colIndex) {
return false; //Disallow the editing of any cell
}
};
days.setBorder(new LineBorder(new Color(0, 0, 0)));
days.setBounds(55, 314, 496, 116);
JScrollPane scrollPane = new JScrollPane(days);
scrollPane.setPreferredSize(new Dimension(452, 150));
JPanel p1 = new JPanel();
p1.setBounds(49, 263, 523, 159);
p1.add(scrollPane);
frame.getContentPane().add(p1);
顺便说一句 - 谁能向我解释以下 sn-p 的含义：(Component[] com)？我复制了这段代码，除非获得许可，否则表格将不可编辑，但我不明白它是如何整体工作的。
Component[] com = panelinfo.getComponents();
//Inside you action event where you want to disable everything
//Do the following
for (int a = 0; a < com.length; a++) {
com[a].setEnabled(false);
}
frame.getContentPane().add(p1);
try {
con = DriverManager.getConnection("jdbc:mysql://localhost:3306/testing1","root", "password");
} catch (SQLException e) {
System.out.println("Connection Failed! Check output console");
e.printStackTrace();
}
displaydays(s);
add.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent arg0) {
if(add.getText().equalsIgnoreCase("Add")){ //equalsIgnoreCase ignores case sensitive
add.setText("Save");
delete.setText("Cancel");
days.setEnabled(false);
Component[] com = panelinfo.getComponents();
//Inside you action event where you want to disable everything
//Do the following
for (int a = 0; a < com.length; a++) {
com[a].setEnabled(true);
}
clear();
ttime.requestFocus();
}else{
int a = JOptionPane.showConfirmDialog(null, "Do you want to save this record?", "Message", JOptionPane.YES_NO_OPTION);
if(a==0){
//try{
try {
st=con.createStatement();
if (arg0.getSource() == add){
ps=con.prepareStatement("INSERT INTO "+s+" (Time, Task) values('" + ttime.getText() + "','" + ttask.getText() + "')");
}else{
ps=con.prepareStatement("UPDATE "+s+" set Time='" + ttime.getText() + "',Task ='" + ttask.getText() + "'where id ='" + ttime.getText() + "'" );
}
ps.executeUpdate();
defautview();
displaydays(s);
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}
});
这是我的“删除”按钮，它应该从JTable 中删除数据，而不是从数据库中删除（目前我的“删除”按钮正在从JTable 和数据库中删除）。
delete.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
int a = JOptionPane.showConfirmDialog(null, "Do you want to delete this record?", "Message", JOptionPane.YES_NO_OPTION);
if(a==0){
try {
st = con.createStatement();
ps = con.prepareStatement("delete from "+s+" where id ='" + txtSearch.getText() + "'");
System.out.println(ps);
ps.executeUpdate();
displaydays(s);
clear();
} catch (SQLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
}
});
days.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent arg0) {
int selectedRowIndex = days.getSelectedRow();
//int selectedColumnIndex = tblList.getSelectedColumn();
String selectedObject = (String) days.getModel().getValueAt(selectedRowIndex, 0);
txtSearch.setText(selectedObject);
search(s);
}
});
}
void defautview() {
// TODO Auto-generated method stub
add.setText("Add");
delete.setText("Delete");
days.setEnabled(true);
Component[] com = panelinfo.getComponents();
//Inside you action event where you want to disable everything
//Do the following
for (int a = 0; a < com.length; a++) {
com[a].setEnabled(false);
}
clear();
}
void clear() {
// TODO Auto-generated method stub
ttime.setText("");
ttask.setText("");// set time and task clear.
}
void displaydays(String s) {
// TODO Auto-generated method stub
try {
st = con.createStatement();
r = st.executeQuery("select * from "+s);
tblModel.getDataVector().removeAllElements();
while(r.next()){
tblModel.addRow(new Object[]{r.getString("id"),r.getString("Time"),r.getString("Task")});// Display the Table into tblModel using ResultSet
}
} catch (SQLException e2) {
// TODO Auto-generated catch block
System.out.println("error");
e2.printStackTrace();
}
}
void search(String s){
try {
st = con.createStatement();
ResultSet rs=st.executeQuery("SELECT * FROM "+s+" WHERE id='"+ txtSearch.getText() + "'");
if(rs.next()){
ttime.setText(rs.getString("Time").toString());
ttask.setText(rs.getString("Task").toString());
}
}catch (SQLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
}
【问题讨论】：
-
如果可能，请尽快提供帮助。 ---> 不适用于公共论坛，
-
为了获得更好的帮助，请尽快发布 MCVE/SSCCE 简短、可运行、可编译的 JTable/XxxTableModel 硬编码值
-
对 JButton 使用 Swing Action/ActionListener 而不是 MouseListener